george



I. A. GEORGE.

METHOD OF MAKING RACEWAY WALLS FOR BEARINGS.

APPLICATION FILED -JAN.8, 1913. 1,173,793. Patented Feb. 29,1916.

' 8 SHEETS-SHEET l- At torney [1 w w n W llllllllllllll Inventor I. A.GEORGE.

METHOD OF MAKlNG RACEWAY WALLS FOR BEARINGS.

APPLICATION FILED ]AN.H,19I3- 1,173,793.

B SHEETSSHl-.ET 2.

Witne es: Inventor Attornjr Patented Feb. 29, 1916.

l. A. GEORGE.

' Patented Feb. 29,1916.

ETS-SHEET 3.

Hilm A l. A. GEORGE.

METHOD OF MAKlNG RACEWAY WALLS FUR BEARINGS.

Wi gs es:

WWW;

B SHEETS-SHLET 4.

l. A. GEORGE.

METHOD OF MAKING RACEWAY WALLS FOR BEARINGS.

nu 11 9 m 6 1 ..D 6m EU a n w n0 P Inventor Attorney Witnesses: MWM

l. A. GEORGE.

METHOD-0F MAKING RACEWAY W ALLS FOR BEARINGS.

APPLICATION FILED JAN. 8, 1913.

1, 173,793. Patented Feb. 29, 1916 v 8 SHEETS-SHEET 7.

Witnesses; v q 7 Ihventor GEORGE.

1,173,793. Patented Feb. 29,1916.

TS-SHEET 8.

Z 3 M\ 0 i t Ww ISAAC A. GEORGE, OI HAMILTON, OHIO.

METHOD OI MAKING RACEWAY-WALLS FOR BEARINGS.

To all whom it may concern:

Be it known that I, IsAAc A. GEORGE, citizen of the United States,residing at Hamilton, in the county of Butler and State of Ohio, haveinvented a certain new and useful Improvement in Methods of MakingRaceway-Walls for Bearings, following is a full, clear, concise, andexact description, reference being had to the accompanying drawings,forming a part of this specification.

My invention relates to the formation of roller bearings employingconically shaped or flaring raceway walls such, for example, as isdisclosed in my co-pending application Serial No. 543,665, filedFebruary 14, 1910, where such raceway walls are broadly claimed, and hasfor its object the provision of an improved method of and structure forproducing such raceway walls.

My invention comprises a method of making raceway walls which consistsin outwardly curling the ends of a metal tube to constitute ballcontainers and upsetting the metal at the base and within one of theball containers to constitute a ball supporting ridge.

The apparatus herein disclosed forms the subject matter of my co pendingapplication Serial No. 790,840, filed September 20, 1913.

The invention will be explained in all of its details by reference tothe accompanying drawings illustrating the preferred way of practisingthe invention and 1n which drawings Figure 1 is a view in elevation ofthe product to be produced by the method and structure of my invention;Fig. 2 is a sectional view of the structure shown in Fig. 1, the ballsbeing illustrated in position within the raceway walls shown in Figs. 1and 2; and Figs. 3 to 20, inclusive, are views illustrating the varioussteps employed to produce the raceway walls.

Like parts are indicated by similar characters of reference throughoutthe different figures.

The tapering raceway wall 1 comprises the inner raceway member of ahearing such as is disclosed in my'aforesaid co-pending application,this inner raceway member having the tapering seat received within thetapering bore. of the raceway wall. The raceway wall is curled at itsedges to constitute containers for holding the balls 2.

Specification of Letters Patent.

of which the Patented Feb. 29, 1916.

Application filed January 8, 1918. Serial No. 740,772.

The raceway wall is made from a disk of sheet metal 3 (Fig. 3) which ispreferably so operated upon by the preferred form of structure of my.invention as to have the degrees of inclination upon the exterior andinterior of the raceway wall similar whereby the thickness of theraceway wall is substan tially uniform throughout, with the excep tionof the overturned edge portions, where'- by the uniformly thick portionof the raceway wall is able to be treated by heat uniformly inhardening. In being hardened the larger end of the raceway wall isimmersed first.

The first step in the operation is illustrated in Figs. 3 and 4, thedisk plate 3 being initially placed upon the edges of a female die 4having a cylindrical bore and co-axial with respect to a punch 5, thedie 4 being of an inwardly convexed or bulging flaring formationproperly to coiiperate with the punch to impart an initial cup shape tothe plate 3 as illustrated in Fig. 4, in which figure the plate 3 hasbeen brought to a shape in which thethickness thereof is substantiallyuniform excepting at the upper periphery of the cup. The cup 6 iscylindrical at the outer portion of its upper .6 is then removed fromthe punch 5 and is placed upon the upper edge of a female die 7 having abore which is'generally cylindrical but flared at its upper end wherethe die 7 is inwardly convexed. A punch is caused to operate upon thecup, this punch having a cup entering portion 8, that is considerablysmaller than the cup interior, and an overhanging portion 9 which is toengage the top of the cup.

Clearance between the punch portion 8 and the Wall of the die 7 issomewhat in excess of the thickness of the cup wall so that when thepunch is caused to descend the cup 6 will be caused to assume the shapeshown in Fig. 6. In each punch and die operation it is understood thatthe axes of the punch and die are coincident. It will be observed thatthe cup 6, in Fig. 6, has been slightly upset at 10 for the purpose offorming a ball bearing ridge in the final product excess of thethickness of the cup wall so, punch is'caused to descend iss The cupaltered by the portions as wiH appear, the curved upper portion of thedie 7 and the punch serving to force sufficient metal upwardly to securethe formation illustrated. The cup 6 is next removed from the punch 8, 9and is, laced upon the upper curved edge of the emale d1e'11 havingvabore which is generally cylindrical but flared at its upper end wherethe die 11 is inwardly convexed,-the curve being materially less thanthe curve at the upperportion of the die 7 and closelyapproximatin thecurvature of the ball containing poc et to be formed at one end of theraceway wall under construction. The die 11 is also indicated as havinga recess 12 into which the upper end of the cup may be pressed. A punchis caused to operate upon the cup, the punch having a cup entermgportion 13, that is considerably smaller than i the cup interior, and anoverhan 'ng portion 14 that is to engage the top '0 the cup. The outerperi heral edge of the portion 14 anda circula edge of correspondingdiameter of die 11 constitute trimming edges evenly to trim theoverhanging portion of the flange on the tube 6. Centering points 5 8and 13 operate to keep the work on center.

Clearance between the punch portion 13 andthewall of the die 11 issomewhat in that when the the cup 6 will be caused to assume the shapeshown in Fig. 8, the upper curved end of the die shaping the outer partof the cup approximately into the curve of the bal contaming pocket nowpartially formed, the portion of the cup between its rim andthe ridge 10projecting horizontally owing to the overhanging portion 10 of the limband the receiving recess. 12 of the e 11. 6 is next removed and isplaced partially within the taperin%bore of a female die 15 asillustrated in ig. 9, the upper edge of this die 15 being curved toapproximate a part of the curvature of the ball containing pocket to beformed, there being an annular recess 16 at the upper end of the die inwhich the ridge 10 is accommodated. The die 15 has an annular recess 17to afford clearance for the outer rim of the cup when the punch that isto be described descends.

his punch has cylindrical portion 19, and

an overhanging portion 20, the cup 6 having its structure 18' and 20ofthe punch while at the same time the bottom of the cup is removed bythe cylindrical portion 19 of the punch in coiiperation with a shearingrin 21 located below the die, ring 21 rising to sledge the work, thelmock out pieces being hollow to permit the cup bottom to drop through.That which was the cup as illustrated in Fig. 9 now has becomethe sleeveelement 22 in Fig. 10, the punch the ridge 10. An annul a taperingportion 18, a.

portions 18 and similarly directed bore portions of the die 15, theclearance between the die and punch when the punch has fully entered thedie corresponding to the thickness of the sleeve element 22. Theoverhanging punch portion 20 engages the overhanging top por tion of thecup, as seen in Fig. 9, to cause the metal ridge 10 to be further upsetwithin the recess 16 of the die 15.

he sleeve 22 as produced by the opera tions described in connection withFigs. 9 and 10 is next almost completely inserted within the bore of afemale die 23, Fig. 11. The punch. 24 is thereafter depressed 'to bringthe sleeve or tube 22 into the shape illustrated in Fig. 12. The sleeveor tube then withdrawn from the bore of the die 23 and is thereafterinserted within the bore of the female die 25, Fig. 13. The punch 26 isthereupon lowered to elongate the lower cylindrical portion of the tube22 and'to bring the same into the shape illustrated in Fig. 14, thepunch 26 having an upper tapering portion and a lower cylindricalportionfor this'pur ose.- The sleeve or tube 22 is thereafter p aced within thebore of the female die 27, Fig. 15, whereafter the punch 28 isdepressed, see Fig. 16, further to modify the shape of the sleeve ortube 22. The sleeve 22 is next inverted with the flange thereof seatedupon the curved periphery of a die 29 that has a central upwardlyextending conical projection 30 corresponding to the tapered ortion ofthe tube 22. A hollow punch 31 as the lower portion of its-bore taperedto correspond with the tapering part of the sleeve or tube 22 and anupper portion of the bore cylindrical to corres end with the cylindricalportion of the tube 22. This unch 31 has a curvature at its lower encorresponding to the curvature that is to be provided within the ballretaining pocket 4 provided at the larger end of the raceway wall asshown in- Figs. 1 and 2, the lower end of the punch having an annulargroove or depression for preserving the shape oi ar space intervenesbetween the conical portion 30 of the die 29 and the outer portion ofthe die, clearance intervening between the inner and outer portions ofthe die and the annular ortion of the punch, when the punch is 1ydepressed, as indicated in Fig. 8 that partially corresponds to thelarger end of the raceway wall. The tube 22 is next placed upon thetapering portion 32,.Fig. 19, of a die 33, the ta ring portion 32fitting1 the tapered ortlon of the tube, the die aving a suitab eannular recess for receiving the outwardly curved 19 being complementalto 1 the shape of clear space to permit of the operation of operatedupon to produce the desired result, the punch 3i thereupon. The punch 31 has any suitable steps being employed in the an annular recess 85 forreceiving the upper formation of the cup in order to adapt itcylindrical portion of the tube 22, this anto the purpose of theinvention. nular recess being curved, as illustrated, so Reference maybe had to my co-pending that when the punch is depressed in theapplications Serial Nos. 726,290 and 726,291, position illustrated inFig. 20 the cylinfiled Oct. 17, 1912 (Cases A and B). drical end of thetube is curled to form While I have herein shown and particuthe ballcontaining pocket illustrated at the larly described one way ofpractising the smaller end of the raceway wall 1 of Figs. method of myinvention and one form of 1 and 2. The punch 34 has an annular mechanismfor producing the product, I groove 36 for receiving the outer edge ofdo not wish to be limited to the precise the curled flange at the largerend of the details set forth, but tube 22, this recess 36 being soshaped as to Having thus described my invention I form the curled flangeat the larger end of claim as new and desire to secure by Letters thetube 22 into the shape illustrated in Patent the following Fig. 20, thecomplete raceway wall 1 being The method of making raceway walls forshown in this figure. bearings which consists in outwardly curl- I haveshown and described the method ing the ends of a metal tube toconstitute of and apparatus for transforming a disk ball containers; andupsetting the metal atof sheet metal into a raceway wall having a thebase and within one of the ball containtapering bore and exterior andoutwardly ers to constitute a ball supporting ridge. curled at its endsto form ball containers, In witness whereof, I hereunto subscribe thoughI do not limit myself to the initial my name this 18th day of December,A. D. employment of the sheet metal disk since 1912.

obviously effective operations may be com- ISAAC A. GEORGE. menced withsheet metal in otherjforms. Witnesses: For example, the process may beinitiated G. L. CRAGG,

with a suitably shaped metal cup which is E. L. WHITE.

